Just by process of elimination it'd have to be someone from this list (no matter how likely/unlikely):
iLikeToSnipe I know I'm town, I stopped the first NK with my BP, and if I was mafia I could have just not said anything to avoid getting KY killed
OrangeP47 claimed/semi-confirmed third-party
FRAYDO identified KY as mafia performing the NK due to his tracking action
Jeod
Retaliation
Louis
Cat5
Doing a second pass of that list, I really don't think it could be Retal. He's a smart player, he's done some legit scum hunting, and if he really was going to off KY to bus him and gain town cred (which would then give mafia a supposed TWO day kills; cause I'm assuming KY's ability was a day kill) they could have delayed to do so much more to sow distrust and doubt amongst town. If Retal is mafia he's made a terrible mafia play, followed it up with doing a great job pretending to be town, and we've got some insane "balancing" going on here.
Jeod
Louis
Cat5
After taking the time to read through everything, it just comes down to one thing. Cat5 claims he got a confirmed action of a mysterious player. An action called Scatter that roleblocks anyone who visits the targeted player. I don't have that action, nobody eliminated from this list has claimed they have it. So that means either Cat5 is telling the truth and Jeod or Louis are lying, or Cat5 is lying. And whoever is lying is scum.
Jeod vouches for Louis's abilities, so she can't have this scatter ability. If Jeod is somehow lying about that, that makes him scum. So we can safely take Louis off this list for now. That leaves Jeod and Cat5.
If Jeod is scum, he'd know that Cat5 is town and thus not lying. In that case, why would Jeod clear Louis? That would mean if we lynch Cat5 and he flips town, Jeod has to be the one with this Scatter ability and he's just doomed himself. We did have a choice between Cat5 and Sunflower, but Sunflower has now flipped town. Our most likely candidate for scum is Cat5, just by process of elimination.
If someone can come up with more arguments/evidence one way or the other, that'd be great. Right now I'm thinking we go for Cat5 tomorrow.